Colorado Parks and Wildlife and multiple partners are urging anglers to carry thermometers with them and quit fishing when the water in rivers and streams hits 67 degrees.

“We’re definitely concerned right now. Temperatures are reaching the high 60s and even 70 on the Colorado (River),” Kendall Bakich, an aquatic biologist with CPW for area 8, said Tuesday.

The agency last sought a voluntary fishing closure on the Roaring Fork for high water temperatures and low flows in 2012. Bakich said anglers are urged to go out earlier in the day, when air and water temperatures tend to be lower.

“Two o’clock is a good rule of thumb” of when temperatures climb, she said.

Rick Lofaro, executive director of Basalt-based Roaring Fork Conservancy, said the nonprofit organization is working with CPW, Trout Unlimited and the Roaring Fork Fishing Guide Alliance to spread the word about the voluntary closures of waters in the valley.